HCD-MJ1, HCD-MJ1A - Sony Audio Service Manual (repair manual). Page 3

– 3 –

US, Canadian model

: AC120V 

⁄60Hz

AEP, UK, German, Italian model

: AC220-230V 

⁄50/60Hz

Hong kong, Sinagpore mdel

: AC110-120V/AC220-240V 

⁄50/60Hz

Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.

This Compact Disc player is
classified as a CLASS 1 LASER
product.
The CLASSLASER
PRODUCT label is located on
the rear exterior.

For customers in Europe

This caution la-
bel is located
insuide the unit.

Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation expo-
sure.

After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer :
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM
or battery-operated AC voltmeter. The “limit” indication is
0.75V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of a
passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)

Earth Ground

Fig. A.  Using an AC voltmeter to check AC leakage.

AC 
Voltmeter
(0.75V)

0.15

µ

F

1.5k

Ω

To Exposed Metal
Parts on Set

! 

!

!